Apparatus for sprinkling band-like webs or foils, more particularly roofing felts



June 14, 1960 c. Do'r'r 2,940,422

APPARATUS FOR SPRINKLING BAND-LIKE WEBS 0R Fons, MORE PARTICULARLYRooFING FELTs Filed April 23, 1957 INVENTOR. Caspar Dott United StatesPatent "O .arrmrus non snRnsxLlNoANn-Lmn wens .oRLFgna :MOREPalmera;ARL-r RoomNG nu T This invention. relates -to a process and anapparatus r-forsprinkling material of a-granularor lpulverulentqualliity onto .band-like vwebs or foils made of any ydesired -material,e=g. paper, pasteboard, woven and spun fabrics, metal, synthetic plasticmaterial, more-particularly/for themanufacture of roofing -felts,insulating pasteboard, `'webs of proofing materiaLYinsulating matsandthe like.

For sprinkling ra-granular or vpulverulent substance ontoIwebsofmateriah more particularly roofing feltsritis rknown `toanangefor the sprinkling material `'to-drop directly onto the webom asprinkling material-container -arranged .above vthe web, andit ispossible to -regulate )the quantity of material sprinkled by -afgatesituated-at the voutlet :end of .the container. ISince -the ,quantityofmaterial sprinkled onmust .always .bel greater A.than `the quantitywhich can be held inasecurely .adlheringmanner 4by the web, which Yisvprovided with a `cement, and since vthe@non-adheringsprinkled materialhas tolbe removedagainifrom the web, it hasalready been proposed tochange the .direction of travel of the web byapproximately 180 vabout arotatingcylinder, so `that .thesurplus sprinkled material .can Yfall olf.or-be beatenoif. Thissurplusis either lost.or else itis collected in.containers or the like. v From this point. it is :returned vto thesprinkling material Vcontainer by way of intricate and expensiveapparatus.

This invention relates to a further development and improvement .of theknown process: and-.apparatus. It is characterized in that the surplussprinkled .material which has not come toadherefasttothe'webis takenover by the conveyor device which feeds the Lsprinkingmateriallo'nto'-'the*web,-and can-travel fromthe -said conveyor devicedirectlyback to the web. According tothe inveni'tionf'anysprinkled materialwhichffalls down unused at the .sides of the web is-also collected andlikewise returned to theconveyordevice.

The conveyor device Vused .is preferably an endless conveyor belt oneend of which is'Situated in the region whereinthe surplus sprinkledmaterial falls olf theupwardly .deflected web,.and whose other end islocated -below the outletapertureof thesprinklin-g materialcontainer.The sprinkling material container expediently opens into a horizontaloutlet slot bounded by straight sides, and the spacing of the outletslot from the conveyor belt can be adjusted in order to regulatequantity of material issuing from the container.

With this process and -arrangement there is no need for any furtherpower-consuming device for transporting back the surplus sprinkledmaterial, resulting in wear and tear, nor is there any need for specialsupervision of the sprinkling apparatus; yfor if there is anyinterruption in work or if the whole sprinkling apparatus stops, thespriuking material after spreading out to its natural angle of repose onthe appropriately widely dimensioned conveyor belt, comes to a completerest. When production begins, it is merely necessary to adjust thespacing between the endless conveyor belt and the outlet aperture ofythe sprinkling material container of the sprinkling 2,940,422.PatentedJune 1.4, V1.960

F"ice VFrnaterial to :be .used. .The `quantityregulation11oftheanaterial to be: sprinkled-.on canalsobeleffectedbyv varyhinglthe:travelling: speed of the conveyor-belt.

sprinkled-'material alwaysfalls down .unused laterally of 'the web.According to afurther feature of the invention :it Ais -pr'oposed that.this surplus materialalso-v shall v.be brought backiagain intotheworking process in the shortest-way and ina simple fashion.VVFor..thisfpurposethere .are provided, laterally ofthe sprinklingszone, Vvcollecting fdeviceslfor Vthe sprinkled material whichfallstnear -the .said zone. .A conveying Ydevice at thesame timecollects l.the.sprinkledmaterial comiughom the collecting .device and.returns said material A. again to `the sprinkling ...m-aterialcontainer. 'Wheels whichhave a troughfshaped cross- Ysection,`peripherally and `are sub-divided .into individual .segments, areexpediently mounted one on each :.side of .the conveyor belt. `As.the-wheels.rotate, .thesprinkled `material collectsin the `segments,.is-conveyed upwards andfallsV back overa gandeplate onto.theconveyorsbelt .or back into the :sprinkling material container.A.In-.this way no sprinkled materialis lost, Yandsurplusmaterial .isYused again .immediatelyin .them same Working-process.

One lexample of embodiment .ofthe .subject of. the. invention isyillustrated diagrammatically in the accompanying Vdrawings in'whichtYPig. :1.is alongitudinalsectional vview takenon Y.the lined-'ll of'Fig.'.2 of the. sprinkling apparatusaccording tothe inventiongand Fig. `2isa crossfsectional view taken on-'thelineII-.II ofFig. 1.

Two cylinders I3 and 4for deliecting-the direction .of travel of the web.ofmaterial 2 are arranged one `above `theother on axles 3a and 4arespectivelyina-frame-l, and are somewhat `oilset laterallyso Ythat.fthe web 2 which is movedY in lthe direction ofthe arrows Sfismade totravel in the reverse direction for..a slight distance .andat aninclination tothe horizontal, above .therst cylinder -3. VThe sprinkling.apparatus consists of a sprinklingmaterial container or'hopperand acon-Veyor belt 7 which is'arranged4 below `the said container and whichtravels in the direction of .lthearrow 10 .about -the rollers 8 and 9.The sprinklingmaterialcontainer 6 has an outlet slot 11 which isdisposed in thehorizontal plane and whose spacing from the upper surfaceof the conveyor belt 7 can beadjusted. The spacing between the conveyorbelt 7 and the outlet' slot 11 of the sprinkling `material container 6can' advantageouslybe variedzbydirectly lifting or lowering the`containeritself by meansof one or'more eccentrics 12 on which thecontainer *frame bears. A `tur-ther possible -methodof regulatingthequantity of material sprinkled can be to vary the speed of travel ofthe conveyor belt 7. Any sprinkled material which falls off thedeflected web 2 and is situated on the cylinder 3 is guided by astripper 13 back onto the conveyor belt 7.

The sprinkling material container 6 is advantageously given an outletaperture 11 of such a length that t-he outer edge zones of the web 2 tobe sprinkled are adequately dusted with sprinkling material. In order tomake it possible to utilize sprinkled material which falls downlaterally near the web 2, there is provided a conveying device which inthe example of embodiment is constructed as a bladed wheel 14 at eachside of the apparatus. The wheel 14 is constructed in trough-shapedmanner at its periphery, the trough 15 being sub-divided by blades 16 orthe like into a plurality of segments or compartments 17. 'Ihe guideplates 18 suitably mounted zone. The'guide plates 19 also supportedV onthe iframe 1 and which are arrangedaboye the sprinkling materialcontainer-f6 {s 'el've -to Yconvey back into thev container i6"prinkledmaterial' which hasbeen-gravit'ationally ejected f'belov'vjtheconveyorY belt 7 over the guide cylinders3 and I4. Sprinkling materialfrom the'container 6 is taken "'npb'ythe rotating. conveyor belt 7 andfalls therefromr 'ontoitlie upper side ofthe web 2. A proportion of thesprinkled mateiiahcovering thevweb completely,'is` env Y A 20jA 4.5The'structure of'claim v1'; said material elevating.

4trained by the adhesive coating of 'the said web, while the surplussprinkled material Vfalls downwards when the web -is madeto'changedirectionlaboutthe cylinders '3 and 4, lFasV showny inV Fig. 1.The non-adhering portion of the j's'p'rinkledmaterial passes onto theouter surface ofthe e cylinder Sto the stripper Y13,V which removes saidmate- MAYrial from the cylinder and conveys it to the conveyor belt 7.The conveyor Vbelt 7 guides this quantity of vsprinkled'material tobelow the sprinkling material con-IY ftainer 6-'=and said quantity ofsprinkled material is sup Y t; pl'emented Alay-'further supply of thesame Vmaterial from j the said container, and the conveyorbeltpdischarges the material onto the-upper side of the web 2.

f''fTheexcessrsprinkled material 21Y which Yfalls downs-to.A ,l theright Yand left laterally of the-web 2, when theupper ffsiderofathe web2 is'being sprinkled, as shown in Fig.t2, is directed by the guideplates1l8 whichare situatedat Yeachrside of the web, into thecompartments 17 of the 'wheels"14, which raise the material collected inthe comy partments and discharge it, at the top ofthe rotary path u oftravel ofsaid wheels onto the guide plates 19. The

sprinkled material slides down these latter guideV plates Y back intothe container 6. Itis alsoposrsible to have such an arrangement that thesprinkled material falling downon each'siderof the web is conveyed toone and the same wheel 1-4 by'appropriate guiding of the guide plates.It mayrhappen that the web 2 may deviate laterally lsomewhat from thedirection'of movement.' In order to Y make it possible for the outletaperture of the container 6 `to allow fory such movement, the sprinklingmaterial `container V6 can Vbe mounted in such man'nei as to belaterally displaceable. What is claimed is: t

' 1I Apparatus for sprinkling granular material on a continuously movingweb and recovering excess material for'freusa' said apparatus comprisingasupport frame, lvertically disposed'supply hopper means Von said frame,means on said frame for supporting a continuous web in vmovementsubstantially horizontally beneath said hopper, Y

4theevi'raineV lruserve to collect any sprinkled 'materiali whiclrfalls'down laterally of the webv in the sprinkling #covered with an-a'dhesivesubstan'ca the web2 trav-elsf 41 discharge means supported onsaid vframe beneath said hopper and above thevpath of travel of said weband receiving material from said hopper and depositing materialtransversely of the path of travel of said web and t5 laterally overtheside edges thereof, material elevating means receiving excessgranular material laterally from said web and returningit to`said hoppermeans, and webinve'rting'means spacc'edA` from said ldischarge means'and 3 receiving. excess lgaiiularmterialdropping from isaid web as itis invertedand directing this excessniaterial ...back to saiddischargemeans.,V-YM fr ,t i 2. The structure" o'f` clin1'"'1;" saiddischarge means comprising `ai1 ndless;belt'-cozive'yorV in'aihori'zontal plane and underlying hopper ,andreceivng material ,fromsaid web-invertingmeansiVVV i 3..,The structure-ofY claim 2; andjstripper means extending between said web-inverting means and saidendless conveyor and directing excess material from `said web-invertingmeans tolsaid endlessV conveyor.

V-ineans'comprising first conveyor means underlying said path oftravelof said web and directing'excess vmaterial @laterally beneathySaidpathY of travel, second conveyor means overlying said'hopper meansand extending later- 251' ally`V and downwardly toward the hopper, landtrough cross-sectioned conveyor wheel means mounted on an axis ofVrotation-between said tirst 'and second conveyor means and having aradius greatery than the distance from saidaxis Yof rotationl to eitherof said conveyor means, -s aid first andsecond conveyor means bothextending Mlaterally into said conveyor wheel means and l:said rstconveyor means directing material intoy said wheel means, sai'd; secondconveyor meansreceivingexcess material *from said conveyor wheel means,'saidA conveyor wheel means including inwardly openingmaterialrreceiving portions on the inner periphery thereof forcarryingmate- 5 rial along said wheel from said rst'conveyo'rvmeans' tosaidsecond conveyor means'. j iff l l5. 'I'he structure of claim 4; saiddischarge means com- 40 pri'sing anfendless belt conveyor underlyingsaid hopper i, and vreceiving material from said web-inverting means. e6*.The structure of ,claim 5; said endless belt Yconveyor Yand saidconveyor wheel means having a common axis (of rotation.

' References ACited in the tile of this patent Y t y t UNITED STATESPATENTS j 366,186 Richards, i .Jnly 5, 1887 5b .1,185,329 Y Ianisch May30,1916 1,520,014 YCumfer Dec. 23, 1924 e "1,696,171 Lipsius EDec.18,1928 1,840,396 L Jones Vrlan. 12, 1932 2,037,788 Hultberg 1 'Aprl 21,1936 v2,037,822l Robert Apr. 21, 1936 $2,573,270 Miller Oct. 30,19512,661,303 Y Fasold. et al. Dec. l, 1953 V2,681,637 Simpson June' 22,1954 'Mem

